Shown with a cast-on count of 35 stitches.  

• Row 1 (RS): K17, k1, k17.
• Row 2: P17, p1, p17.
• Row 3: Yo, [k1, yo] 5 times, [ssk] 3 times, [k2tog] 3 times, yo, k1, yo, [ssk] 3 times, [k2tog] 3 times, yo, [k1, yo] 5 times (37 sts).
• Row 4: K18, p1, k18.
• Row 5: K18, k1, k18.
• Row 6: P18, p1, p18.
• Row 7: Yo, [k1, yo] 5 times, [ssk] 3 times, [k2tog] 3 times, [yo, k1] 3 times, yo, [ssk] 3 times, [k2tog] 3 times, yo, [k1, yo] 5 times (41 sts).
• Row 8: K20, p1, k20.
• Row 9: K20, k1, k20.
• Row 10: P20, p1, p20.
• Row 11: Yo, [k1, yo] 5 times, [ssk] 3 times, [k2tog] 3 times, [yo, k1] 7 times, yo, [ssk] 3 times, [k2tog] 3 times, yo, [k1, yo] 5 times (49 sts).
• Row 12: K24, p1, k24.
• Row 13: K24, k1, k24.
• Row 14: P24, p1, p24.
• Row 15: Yo, [k1, yo] 5 times, [ssk] 3 times, [k2tog] 3 times, ssk, k1, [yo, k1] 10 times, k2tog, [ssk] 3 times, [k2tog] 3 times, yo, [k1, yo] 5 times (57 sts).
• Row 16: K28, p1, k28.
• Row 17: K28, k1, k28.
• Row 18: P28, p1, p28.
• Row 19: Yo, [k1, yo] 5 times, [ssk] 3 times, [k2tog] 3 times, [yo, k1] 5 times, yo, [ssk] 3 times, k1, [k2tog] 3 times, [yo, k1] 5 times, yo, [ssk] 3 times, [k2tog] 3 times, yo, [k1, yo] 5 times (63 sts).
• Row 20: K31, p1, k31.
• Row 21: K31, k1, k31.
• Row 22: P31, p1, p31.
• Row 23: Yo, [k1, yo] 5 times, [ssk] 3 times, [k2tog] 3 times, [yo, k1] 5 times, yo, [ssk] 3 times, k2tog, [k1, yo] twice, k1, ssk, [k2tog] 3 times, [yo, k1] 5 times, yo, [ssk] 3 times, [k2tog] 3 times, yo, [k1, yo] 5 times (69 sts).
• Row 24: K34, p1, k34.
• Row 25: K34, k1, k34.
• Row 26: P34, p1, p34.
• Row 27: Yo, [k1, yo] 5 times, [ssk] 3 times, [k2tog] 3 times, [yo, k1] 5 times, yo, [ssk] 3 times, [k2tog] twice, [k1, yo] 4 times, k1, [ssk] twice, [k2tog] 3 times, [yo, k1] 5 times, yo, [ssk] 3 times, [k2tog] 3 times, yo, [k1, yo] 5 times (75 sts).
• Row 28: K37, p1, k37.
• Row 29: K37, k1, k37.
• Row 30: P37, p1, p37.
• Row 31: Yo, [k1, yo] 5 times, [ssk] 3 times, [k2tog] 3 times, [yo, k1] 5 times, yo, [ssk] 3 times, [k2tog] 3 times, [k1, yo] 6 times, k1, [ssk] 3 times, [k2tog] 3 times, [yo, k1] 5 times, yo, [ssk] 3 times, [k2tog] 3 times, yo, [k1, yo] 5 times (81 sts).